What factors can help you not only increase your gains but determine if a successful trade may be a good potential investment (for your other account of course...never invest in an account dedicated to trading)?

Green Mountain Coffee Roasters reported earnings that were better than expected due to strong second-quarter results and a new distribution deal with Wal-Mart.  The stock closed up $19.58 or 37.13% (with an intraday gain as high as 50%) on the NASDAQ exchange.